Sunday, December 25, 2016

Summer is coming, know your sunscreen's ingredients.

Summer is coming, know your sunscreen's ingredients.

(Dr Ghohestani Interview with San Antonio Express News)

Knowing the ingredients in sunscreens and how they work will help you choose the best sunscreen product for your skin.
Sunscreens work in two different ways:

Physical Blockers. Some sunscreens (often called sunblocks) have ingredients that form a physical barrier that blocks, scatters or reflects all types of UV rays. Two common ingredients are:

• Zinc oxide is most often found in white or colored ointments that can be seen on the skin. Microfine zinc oxide (Z-cote) is a transparent zinc oxide used in sunblocks. Both types of zinc oxide protect against both UVA and UVB.
• Titanium dioxide is often included in sunscreens with other ingredients. It is less visible  than zinc oxide but still may show as a white film on children with darker skin. It protects against both UVA and UVB.
Chemical Sunscreens. Other sunscreen ingredients work by absorbing UV rays. Most of these ingredients absorb UVB rays. A few of the newer ones absorb only UVA rays. They are:
• Avobenzone (also called Parsol 1789) is not visible on the skin.
• Oxybenzone is not visible on the skin.
PABA is a sunscreen ingredient that is rarely used now, because it caused skin reactions in some people.
Choose the Best sunblock for sun protection.
There are many kinds of sunscreen. When properly applied, these sunscreens offer protection from the damaging effects of UV rays. Pick the formula that best meets your needs:
• Creams & lotions go on thick and stay on better, but they can be messy.
• Gels are somewhat harder to see, so it's easier to miss an area. Also, alcohol-based gels are more likely to irritate young children's skin.
• Sunscreen sticks are less likely to run into children's eyes. They work well for children's ears, forehead, nose and cheeks.
• Sprays take less time to apply and can save you from having greasy hands, but it can be hard to apply it evenly to all areas. Be careful to avoid spraying children's eyes.
• Towelettes are easy to throw in a bag or take on an outing. You'll want to pack at least one per child.
Waterproof or sweat-resistantsunscreens provide some additional protection for active outings but will still rub off. Remember that waterproof sunscreens need to be reapplied at least every 2 hours, especially if the children are playing in or with water or are using towels to dry off.
Colored sunscreens can be fun for kids, and can help you see where you've missed. Be aware, though, that they can stain clothing. There have also been reports that some children may react to the dyes in these products.
Sunscreens with bug repellent must meet the SPF rating on the container. However, if a product containing DEET bug repellent is reapplied every 2 hours, a child may get too much DEET. Look for a sunscreen with insect repellent that does not contain DEET.
If you need both sunscreen and a DEET-based bug repellent, apply the sunscreen first. Then apply bug repellent 15-30 minutes later, after the sunscreen has soaked into the skin.

Skin, Sun and Sun Block

Dr. Ghohestani's interview with San Antonio Express News (Updated by TID)

No SPF? UVA and UVB will leave you RED Dr. R. Fredrick Ghohestani, of the Division of Dermatology and Cutaneous Surgery at UTHSC,recommends that people wear at least SPF 30 every time they step outdoors.

If there is one thing the chief of the Division of Dermatology and Cutaneous Surgery at the University of Texas Health Science Center wants people to know about the sun, he emphasizes that sun protection needs to start at an early age.


A is for ASYMMETRY: One half of a mole or birthmark does not match the other.

B is for BORDER: The edges are irregular, ragged, notched or blurred.

C is for COLOR: The color is not the same all over and may include shades of brown or black,sometimes with patches of red, white or blue.

D is for DIAMETER: The spot is larger than 6 millimeters across (about the size of a pencil eraser) or is growing larger.

E is for EVOLVING: The mole or birthmark is changing in any way.

Dr. Ghohestani said recent studies show that people who were sunburned as children are three to five times more likely to get skin cancer as an adult.
It's very, very important to emphasize sun protection for kids, Dr. Ghohestani said. Most people think that's not a big deal and then they end up having cancer 20-50 years later.

According to the National Cancer Institute, skin cancer is the most common form of cancer in the U.S. Every year, more than 1 million Americans are diagnosed with skin cancer.

Ultraviolet rays cause cancer by damaging the cell's center, which controls the proliferation of cells. These rays are subdivided into three categories according to their wavelength: UVA, UVB and UVC. Research and studies show that UVB rays directly cause these mutations in the DNA.
Ghohestani said that to avoid these harmful changes, it is important for people to protect their skin from the sun.

Ghohestani said he encourages people to use sunscreens that block both UVA and UVB rays every day.

We know recently that UVA is damaging to skin and chronic exposure is harmful to the skin as well, he said. We see sun-damaged skin on the left side of drivers from the windows in their car windows only block out UVB rays, not UVA rays. He said people who do not put on sunscreen every day, especially those who spend a lot of time driving, tend to have more wrinkles on the left side of their face because of sun damage.

Ghohestani recommends that people wear at least SPF 30 every time they leave their home, even on cloudy days and road trips. An adult should apply about two tablespoons of sunscreen at least 30 minutes before going out. Sunscreen should be reapplied every two hours.

He explained that without sun protection, a fair-skinned person turns red after about 10 minutes in the sun. If that same individual uses sunscreen with an SPF of 30, it will take approximately 150 minutes for his or her skin to turn red. In general, he said it is not necessary to apply sunscreen with an SPF higher than 50. However, people should consider waterproof sun protection when they are swimming because UV rays can still be harmful through one or two feet of water.

He recommends that people buy hypoallergenic sunscreen that offers protection from the sun's harmful rays. Stores typically sell a mixture of sunblock that physically blocks UV rays and sunscreen that contains chemicals, which absorb the rays.

He suggests people also protect themselves by wearing protective clothing, finding shade, and avoiding direct sun exposure from 10 a.m. to 4 p.m. during summer months. Hats and clothing with high UPF factors help decrease UV exposure. All fabrics have different UPF factors:
closely woven fabric, dark colors, and dry cloth have high UPFs.

Ghohestani urges taking precautions against sun exposure.

We really discourage people to go out and expose their skin to any ultraviolet radiation either through sun or tanning salons, he said there is a correlation between tanning and wrinkles. Instead of tanning, he recommends sunless tanning products commonly sold as creams gels, lotions and sprays. However, in the event that sunburn has already occurred due to tanning or sun exposure, he suggests waiting until it goes away or applying hydrocortisone if it is not blistered. If a burn blisters, does not disappear after a few days, or an allergic reaction occurs, seek medical attention.

Samantha Hensley | 210SA contributor
Copyright, Texas Institute of Dermatology, Laser and Cosmetic Surgery

Keywords: Dermatologist in San Antonio, Skin Cancer